Bad service

I had a contract with MTN and they couldn't supply me with the phone I wanted so I call vodacom and they tell me sure cancel and change to pre paid we can definitely help and we have the phone you want. So after waiting for three months and changing to pay as you go , I get to vodacom carnival mall were they said the phone would arrive just to be told they not getting that phone anymore. So I leave it very disappointed. Then one of my friends go to elrigde and they tell him that they can definitely get the phone in a week no problem. So I get all excited go past your shop and fill out all the paper work etc. And get told it will be here and guess what nearly two weeks later and nothing... so i am on holiday in durbs and phone shelley centre they don't have the phone in stock but will order and call me back, guess what no call. So you please tell me what am I meant to do. Oh and by the way this is will be my 3rd contract with you guys. What is going on seriously.....why cant anyone help. I have used hello peter as my last resort because no one that works at vodacom can help me. I am so disgusted with vodacom's service so unfortunately I had to resort to this.